// Converts the specified object to a List<String>
private static List<String> toList(
String propertyName, ValueExpression expression, Object value) {
if (value instanceof String) {
String strValue = (String) value;
// If the value contains no spaces, we can optimize.
// This is worthwhile, since the execute/render lists
// will often only contain a single value.
if (strValue.indexOf(' ') == -1) {
return toSingletonList(propertyName, strValue);
}
// We're stuck splitting up the string.
String[] values = SPLIT_PATTERN.split(strValue);
if ((values == null) || (values.length == 0)) {
return null;
}
// Note that we could create a Set out of the values if
// we care about removing duplicates. However, the
// presence of duplicates does not real harm. They will
// be consolidated during the partial view traversal. So,
// just create an list - garbage in, garbage out.
return Collections.unmodifiableList(Arrays.asList(values));
}
// RELEASE_PENDING i18n ;
throw new FacesException(
expression.toString()
+ " : '"
+ propertyName
+ "' attribute value must be either a String or a Collection");
}
